GM 90573286 Gear,Camshaft

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To start, unplug the cord from the negative terminal of the battery and remove the timing belt cover. Set engine at TDC for cylinder number one, then turn crankshaft counter-clockwise to 60 degrees before TDC, and pull out spark plugs. Now put on crankshaft locking tool on its place and turn in a direction clockwise until it stands against water pump pulley flange. This places engine at TDC number 1. Next, use tools to hold camshaft sprockets in place while also loosening timing belt tensioner, upper timing belt guide pulleys and lower timing belt guide pulleys so that you may release belt tension. Take off timing belt with camshaft sprockets if necessary. Inspect teeth of sprocket, timing belts; check how camshafts play axially in slots; make sure that there is no wear or damage on the Timing Belt Tensioner; and change any defective part. Ensure that we examine water pump too for its condition as well as clean up our working area around Timing Belt thoroughly together with the sprocket's teeth being washed by lacquer thinner. If we had removed them reinstall Timing Belt Sprockets ensuring their keys are still intact; position mark on these sprockets depending upon which side of keyways they are located into install Crank Shaft Locking Tool over there after removing marks from Teeth of these Pulleys (note: each tooth corresponds to some number). Take off Crank Shaft Locking Tool only after checking whether all Timing Marks coincide perfectly or not Remove crankshaft lock tool depending on engine type following either Engines Before 578511 instructions or Engines After 578512 ones For Engines before 578511 mark time belt guide pulleys positions and fit time belt over camshafts gears ,lower guide pulley and crankshaft gear using a wedge to keep everything stationary Install Time Belt around Tensioner , rear camshafts sprockets and below upper timing belt guide pulley; afterwards adjust positions of these pulleys correctly and tighten the Timing Belt properly. Recheck alignment marks, remove crankshaft lock tool and turn engine to make sure that everything is aligned Tighten pulleys and torque tensioner bolt again. Check all alignment marks Install time belt cover and connect battery back up For Engines after 578512 use tools to check camshaft timing marks Install time belt around rear camshafts sprockets/tensioner/upper timing belt guide pulley/front camshafts sprockets using a gauge that fits on them if necessary; As you rotate them, please don't forget to fully tension it Remove crankshaft lock tool , turn engine to verify alignment, recheck crankshaft & camshaft marks Install time belt cover and connect battery back up Remaining installation steps are just removal process in reverse.

Apply a small amount of RTV sealant to the threads before installing the timing chain guide access plug.